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Old 10-30-2013, 10:41 PM   #1
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Default EMS-4 tach problem

I am still having problems with my tach. I am pretty sure my tach is being driven directly from the crank sensor rather than from the ECU. Per the ECU my idle is around 1000 and the tach reads 2100. Can someone please give me some guidance to correct this whether going through gpio or putting in a resistor is the best way.
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Old 10-31-2013, 12:57 AM   #2
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What year car?
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Old 10-31-2013, 08:58 AM   #3
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What year car?
It is a 2000 running mostly on the stock sensors other than map and no maf.
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Old 10-31-2013, 10:37 AM   #4
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Everything that I've read says to drive the tach via GPIO. You might need to futz with it a bit to get it to work.

There's an option under Tacho Options called "Tacho M" which is the multiplier.

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Old 10-31-2013, 03:09 PM   #5
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Everything that I've read says to drive the tach via GPIO. You might need to futz with it a bit to get it to work.

There's an option under Tacho Options called "Tacho M" which is the multiplier.
Do you know which wire I run the GPIO to? I am assuming I just cut a wire off the crank angle sensor and connect directly to the end going back to the tach?
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Old 10-31-2013, 04:18 PM   #6
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The wiki says that 95.5 - 05 cars need a tach circuit. On my 94, the GPIO tach is wired to the OEM connector.

Sorry I'm not familiar with the NBs as much!
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Old 10-31-2013, 04:21 PM   #7
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Factory tachometer is driven from one of the GPIOs. A pullup resistor is required. All of this is included in our PnP package.
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